Using additional bays for a RAID drive, and an eSATA RAID question too

I'm thinking about getting a Mac Pro soon, and my hope is that I can use the main drive bay for the OS and apps, and then use two of the remaining 4 bays to install two drives that I can set up as a striped RAID array. It appears that this can be done without having to buy the $1000 RAID card, but before I dove in I wanted to check. I'm not worried about losing data, because I'm good about external backups, but rather need to handle many thousands of large photo files quite quickly.
Also, I've got an eSATA RAID set up on my G5 now, and I understand that there are two more SATA ports on the main board of the Mac Pro, and potentially I understand I could plug that in there. But I dread getting the message "you've inserted a drive that isn't recognized, etc.." Anyone know what problems I might encounter here? OWC offers a patch cord that plugs in to them and then goes in to one of the expansion card slots as a kind of extension cord.
Thanks.

Right now on my G5 I have an external SATA two-drive RAID 0 enclosure (basically, just two 500gb drives in an OWC Mercury Elite Pro enclosure) that hooks up to the G5 by 2 SATA cables that plug in to a PCI card slot. My plan was, when I get the Mac Pro, to use the Newer Technology eSATA extender cables from OWC to hook up this drive box to to new machine. (http://eshop.macsales.com/item/Newer%20Technology/MPQXES2/) From what I've read in these fora it appears this is possible, and it seems also to be possible to just use the RAID tool in Disk Utility to set up the internal drives on in slots 1-4 on the Mac Pro.
Primarily I'm needing improved speed for handling lots of large photo files in CS3 and Lightroom. Just from using the RAID setup I have now I've noticed some speed improvements, and with the extra processing power of the Mac Pro I'm hoping to see even more once I make the leap.
Thanks to all of you, by the way, for your input.

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